Anyone looking at our spambot data will notice that Rustock is again back among the spamming botnet leaders, despite being hampered for a time following the McColo takedown last November. Since then it has been a roller coaster ride for Rustock but it is now gaining momentum. Rustock spamming activity is currently responsible for 35% of spam received in our spam traps. Given its prominence, we thought it would be timely to revisit this beast to highlight some of its characteristics.
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Rustock is one of the fastest spambots we have observed (~25,000 spam per hour/bot) and employs a complex rootkit capability enabling it to stay hidden on the computer. Its perhaps no surprise that this botnet is taking the lead again amongst the major spammers.
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